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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Jun. 30, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |
Clean Energy Program, current portion |  | $ 200 | $ 142
PSE And G [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Clean Energy Program, current portion |  | 200 | $ 142
Power [Member] | FERC Compliance [Domain] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency related to bidding errors | $ 25 | 10 |
Maximum [Member] | Power [Member] | FERC Compliance [Domain] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss |  | 135 |
Minimum [Member] | Power [Member] | FERC Compliance [Domain] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 35 |

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